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Experimental macroscope

 
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gpmatthews



Joined: 03 Aug 2006
Posts: 1015
Location: Horsham, W. Sussex, UK

PostPosted: Sat Nov 06, 2010 7:18 pm    Post subject: Experimental macroscope Reply with quote

You may have seen the recent articles in Micscape on The Poor Man's Photomacroscope (see http://www.microscopy-uk.org.uk/mag/artsep10/pj-macroscope.html).

I thought this approach might be worth exploring. CactusDave had some spare lenses and an old microscope stand and I had a spare trinocular head, so here are the first results:


This is the experimental macroscope which matches a Zeiss trinocular head with a reversed Pentacon 50 mm, extension ring and DOI HQ teleconverter (the latter to reduce the magnification).




To enable me to use the unmarked focus control, I stuck on a degree scale and used a miniature video camera and TV thus giving a scale suitable for measuring steps for stacking.




Finally, here is a test image of an old hoverfly sample. Lighting was from a microscope lamp and used an old weighing boat as diffuser. You can see this in the first and second photos above. I have also fitted an LED ringlight on the end of the lens assembly, but this was not used in these tests, as although it is great for manual observation, it is not so good for photos (needs a diffuser).

Here it is in action:


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Though we lean upon the same balustrade, the colours of the mountain are different.
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Craig Gerard



Joined: 01 May 2010
Posts: 2877
Location: Australia

PostPosted: Sun Nov 07, 2010 12:08 am    Post subject: Reply with quote

Graham,

Excellent projects, both this one and the gizmo outlined in the Micscape article. Smile

Using the teleconverter to reduce magnification; this sounds similar to the method some members (and others) have been implementing with the Canon MP-E 65mm.

Graham wrote:
first results

I look forward to more reports/results Smile

Craig
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Cactusdave



Joined: 09 Jun 2009
Posts: 1523
Location: Bromley, Kent, UK

PostPosted: Sun Nov 07, 2010 1:46 am    Post subject: Reply with quote

Excellent Graham. I particularly loved the camera and mini-TV system for measuring focusing steps. Move over Wallace and Gromit! Laughing
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Harold Gough



Joined: 09 Mar 2008
Posts: 5787
Location: Reading, Berkshire, England

PostPosted: Sun Nov 07, 2010 3:55 am    Post subject: Reply with quote

Looks interesting. I'm not sure that your teleconverter is the best you can use. Perhaps you have other plans for your final setup. I used such third party TCs in my early days of photography but Tamron SP are now the only ones I would consider. Perhaps it is not a significant issue as you are reducing magnification in this instance, not something I have tried.

Harold
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Mitch640



Joined: 15 Aug 2010
Posts: 2137

PostPosted: Sun Nov 07, 2010 4:27 am    Post subject: Reply with quote

Rube Goldberg would be proud of that. I love the knob measuring device. Smile
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